Signature change as proposed in issue #16

Exchanged the **kwargs with (positional) keyword arguments.

Rationale: Apparently the only way in Py3.4 to provide an argument
object for fileConfig() and _install_handlers() from the namespace
logging. Said _install_handlers() erroneously initialises handlers only
via vararg unpacking (*args) but failes to unpack kwarg (...,**kwargs).